216655642 has 8 divisors (see below), whose sum is σ = 371409696. Its totient is φ = 92852412.

The previous prime is 216655619. The next prime is 216655657. The reversal of 216655642 is 246556612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7737688 + ... + 7737715.

It is an arithmetic number, because the mean of its divisors is an integer number (46426212).

Almost surely, 2^216655642 is an apocalyptic number.

216655642 is a deficient number, since it is larger than the sum of its proper divisors (154754054).

216655642 is a wasteful number, since it uses less digits than its factorization.

216655642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15475412.

The product of its digits is 86400, while the sum is 37.

The square root of 216655642 is about 14719.2269498096. The cubic root of 216655642 is about 600.6064627243.

The spelling of 216655642 in words is "two hundred sixteen million, six hundred fifty-five thousand, six hundred forty-two".